Heating assembly, atomizing core and aerosol generating device

ABSTRACT

A heating assembly is provided. The heating assembly includes: a substrate; at least one heat generating element, the heat generating element being formed on the substrate; at least two electrical contacts, the electrical contacts being formed on the substrate, and the electric contacts being electrically connected to the heat generating element; and at least one heat insulation structure, the heat insulation structure being formed on the substrate and located between the heat generating element and the electrical contacts. The present invention further relates to an atomizing core and an aerosol generating device. The heating assembly, the atomizing core, and the aerosol generating device provided can limit heat loss of a hot area and avoid the extremely high temperature of a cold area, thereby improving the atomization efficiency and reducing heat resistance requirements of the heating assembly, the atomizing core, and the aerosol generating device for the electric contacts.

CROSS-REFERENCE TO RELATED APPLICATIONS

The present disclosure is a continuation-in-part of International PatentApplication No. PCT/CN2020/108189, filed on Aug. 10, 2020, which claimspriority to Chinese Patent Applications No. 202021019700.2, filed onJun. 5, 2020. All of the aforementioned patent applications are herebyincorporated by reference in their entireties.

TECHNICAL FIELD

The present disclosure relates to the technical field of aerosolgenerating devices, in particular to a heating assembly, an atomizingcore and an aerosol generating device.

BACKGROUND

The aerosol generating device is mainly composed of two parts: anatomizing assembly and a battery assembly. The atomizing assemblygenerally includes an atomizing core and a liquid storage chamber. Theliquid storage chamber stores the e-liquid, and the atomizing coreabsorbs the e-liquid from the liquid storage chamber for atomizing toform smoke. The liquid guiding member and the heating assembly in theatomizing core are the core components of the atomizing technology,which play a decisive role in the taste of the aerosol generatingdevice. The heating assembly is configured for heating the e-liquidtransported from the liquid guiding member to the heating assembly, soas to atomize the e-liquid to generate smoke. However, the heatdistribution in different areas of the heating assembly commonly used inthe prior art cannot be regulated, and the heat loss is serious, therebyseriously reducing the atomizing efficiency. In addition, in the priorart, the edge area of the heating assembly is provided with electricalcontacts for connecting to an external power source; because thetemperature of the edge area of the heating assembly in the prior art isalso very high, the heating assembly in the prior art has to meet highrequirements of heat resistance for the electrical contacts.

SUMMARY

In view of above, the present disclosure provides, in a first aspect, aheating assembly capable of limiting heat loss, improving atomizingefficiency and having low heat resistance requirements for theelectrical contacts.

A heating assembly for being used in an aerosol generating deviceincludes:

a substrate;

at least one heat generating element, wherein the heat generatingelement is formed on the substrate;

at least two electrical contacts, wherein the electrical contacts areformed on the substrate, the electrical contacts are electricallyconnected to the heat generating element;

at least one heat insulation structure, wherein the heat insulationstructure is formed on the substrate and located between the heatgenerating element and the electrical contacts.

In one embodiment, the heat generating element is arranged at the centerof the substrate, and the electrical contacts are arranged at the endsof the substrate.

In one embodiment, the heat insulation structure is located on one sideof the heat generating element, and the at least two electrical contactsare located at one end of the substrate away from the heat generatingelement.

In one embodiment, the heat insulation structure is air cavity.

In one embodiment, the air cavity penetrates through the substrate alonga thickness direction of the substrate.

In one embodiment, a group of air cavities are respectively formed onboth sides of each heat generating element, and a side of each group ofair cavities away from the heat generating element is formed with one ofthe electrical contacts.

In one embodiment, the heating assembly is divided into a cold area, ahot area and a transition area, the heat generating element is arrangedin the hot area, and the electrical contacts are arranged in the coldarea, the heat insulation structure is arranged in the transition area.

In one embodiment, the heating assembly is divided into a hot area, twocold areas and two transition areas along a length direction of thesubstrate, the hot area is located at the center of the substrate, thetwo cold areas are located at opposite ends of the substrate, the twotransition areas are respectively located at two opposite sides of thehot area with each transition area being located between the hot areaand a corresponding cold area; wherein the heat generating element isarranged in the hot area, the two electrical contacts are respectivelyarranged in the two cold areas, the heat insulation structure includestwo groups of air cavities, and the two groups of air cavities arerespectively arranged in the two transition areas.

In one embodiment, the heating assembly is divided into a hot area, acold area and a transition area along a length direction of thesubstrate, the hot area is located at the center of the substrate andextends to one end of the substrate, the cold area is located at theother end of the substrate, the transition area is located between thehot area and the cold area; wherein the heat generating element isarranged in the hot area, the two electrical contacts are arranged inthe cold area, the heat insulation structure includes a group of aircavities, and the group of air cavities is arranged in the transitionarea.

In one embodiment, the substrate includes a first main surface and asecond main surface which are oppositely disposed, two directionsperpendicular to each other are defined on the substrate parallel to thefirst main surface or the second main surface: a first direction and asecond direction; the substrate includes two opposite first side edgesin the first direction and two opposite second side edges in the seconddirection; in the first direction, each of the air cavities includes twoopposite third side edges; in the second direction, each of the aircavities includes two opposite fourth side edges; the two third sideedges are parallel to the two first side edges, the two fourth sideedges are parallel to the two second side edges.

In one embodiment, in the second direction, the distance between thesecond side edge and the fourth side edge of the air cavity adjacent tothe second side edge is W₁, the distance between the two fourth sideedges of each air cavity is W₂, the distance between two adjacent aircavities is W₃, the distance between the two second side edges of thesubstrate is W, then, W=2W₁+mW₂+(m−1)W₃, (mW₂)/W>40%, W₃/W₁>150%; m isthe number of the air cavity, m is a positive integer and m≥1.

In one embodiment, in the first direction X1, the distance betweenopposite side edges of the hot area is L₁, the distance between the twothird side edges of each air cavity is L₂, then L₂/L₁>60%.

In one embodiment, the heating assembly further includes a plurality ofrelease holes, the release hole penetrates through the substrate and islocated in the hot area.

The present disclosure provides, in a second aspect, an atomizing core.The atomizing core includes a liquid guiding member, and the atomizingcore further includes the heating assembly according to the first aspectof the present disclosure.

The present disclosure provides, in a third aspect, an aerosolgenerating device which includes a battery assembly, an atomizingchamber, an airflow passage, and the atomizing core according to thesecond aspect of the present disclosure; wherein the airflow passage iscommunicated with the atomizing chamber; the airflow passage isconfigured to discharge an aerosol flowing out of the atomizing chamberto the outside for a user to inhale; the battery assembly iselectrically connected to the heat generating element, the batteryassembly is configured to provide the heat generating element withelectrical energy required to atomize an aerosol-forming substrate.

The heating assembly provided by the disclosure includes a heatgenerating element, a heat insulation structure (air cavity) andelectrical contacts, and the air cavity is arranged between theelectrical contacts and the heat generating element. Because the aircavity is filled with air and the thermal conductivity of air is low,therefore, the air cavity can limit heat loss of the hot area andprevent the heat of the hot area from rapidly transferring to the coldarea to cause the temperature of the cold area to be too high, therebynot only improving the atomizing efficiency of the atomizing core andthe aerosol generating device, but also reducing the heat resistancerequirements of the heating assembly, the atomizing core and the aerosolgenerating device for the electrical contacts.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic cross-sectional view of an aerosol generatingdevice provided by an embodiment of the present disclosure.

FIG. 2 is a plan view of a heating assembly shown in FIG. 1 .

FIG. 3 is a schematic diagram showing the resistances of different areasof a heating assembly.

FIG. 4 is a plan view of another heating assembly shown in FIG. 1 .

FIG. 5 shows the infrared (IR) characteristics of the heating assemblyshown in FIG. 4 at 550° C.

FIG. 6 is a plan view of another heating assembly.

The part names and reference signs shown in the figures are as follows:

aerosol generating device 100 first side edge 3111 atomizing assembly110 second side edge 3112 housing assembly 10 first main surface A₁liquid storage chamber 13 second main surface A₂ liquid injectionopening 131 heat insulation structure/air cavity 314 liquid outlet 132third side edge 3141 atomizing chamber 14 fourth side edge 3142 smokeoutlet 141 heat generating element 315 battery chamber 15 releasing hole316 airflow passage 16 electrical contact 317 air outlet 161 liquidguiding member 32 atomizing core 30 absorbing surface 321 heatingassembly 31, 31a, 31b, 31c atomizing surface 322 hot area 301 batteryassembly 40 transition area 302 mouthpiece 50 cold area 303 heatinsulating layer 60 substrate 311 liquid absorbing member 70

The following specific embodiments will further illustrate the presentdisclosure in conjunction with the above-mentioned accompanyingdrawings.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

The following will clearly and completely describe the technicalsolutions in the embodiments of the present disclosure in conjunctionwith accompanying FIGS. 1-6 . It is apparent that the describedembodiments are only some of the embodiments of the present disclosure,but not all of them. Based on the implementation described in thedisclosure, all other implementations obtained by persons of ordinaryskill in the art without creative efforts should fall within theprotection scope of the present disclosure.

It should be noted that when an element is referred to be “connected” toanother element, it may be directly connected to the other element orthere may be an intervening element therebetween.

Unless otherwise defined, all technical and scientific terms used hereinhave the same meaning as commonly understood by one of ordinary skill inthe technical field of this disclosure. The terminology used herein inthe description of the disclosure is only for the purpose of describingspecific implementations, and is not intended to limit the disclosure.

Please refer to FIG. 1 , the first embodiment of the present disclosureprovides an aerosol generating device 100. The aerosol generating device100 includes a housing assembly 10, an atomizing core 30 and a batteryassembly 40. The atomizing core 30 and the battery assembly 40 arereceived in the housing assembly 10, and the battery assembly 40 iselectrically connected to the atomizing core 30.

The housing assembly 10 includes a liquid storage chamber 13, anatomizing chamber 14, a battery chamber 15, and an airflow passage 16.

In one embodiment, the aerosol generating device 100 further includes anatomizing assembly 110. Specifically, the atomizing assembly 110includes the liquid storage chamber 13, the atomizing chamber 14 and theatomizing core 30. Further, the aerosol generating device 100 may alsoinclude the battery chamber 15, the airflow passage 16, the atomizingassembly 110 and the battery assembly 40.

In other embodiments, the battery chamber 15 may also not be included inthe housing assembly 10, but is detachably installed with the housingassembly 10. That is, the battery assembly 40 and the atomizing assembly110 are detachably installed.

It can be understood that, in other embodiments, the atomizing assembly110 may be provided separately from the liquid storage chamber 13. Forexample, the atomizing assembly 110 is installed with the batteryassembly 40, and the liquid storage device with the liquid storagechamber 13 is provided separately.

The liquid storage chamber 13 is in communication with the atomizingchamber 14, and the atomizing chamber 14 is in communication with theairflow passage 16. The liquid storage chamber 13 is configured forstoring e-liquid. The atomizing chamber 14 is configured for receivingthe atomizing core 30. The battery chamber 15 is configured forreceiving the battery assembly 40. The airflow passage 16 is configuredto discharge the smoke flowing out of the atomizing chamber 14 to theoutside for inhalation by the user.

In one embodiment, a liquid injection opening 131 is formed on the outerwall of the liquid storage chamber 13. A liquid outlet 132 is formed onthe inner wall of the liquid storage chamber 13. The liquid injectionopening 131 is configured for injecting e-liquid into the liquid storagechamber 13. The liquid outlet 132 is in fluid communication with theatomizing core 30. The liquid storage chamber 13 is in communicationwith the atomizing chamber 14 through the liquid outlet 132. Thee-liquid in the liquid storage chamber 13 enters the atomizing core 30through the liquid outlet 132, and the atomizing core 30 is configuredto atomize the e-liquid to generate smoke.

A smoke outlet 141 is formed on the wall of the atomizing chamber 14.The atomizing chamber 14 is in communication with the airflow passage 16through the smoke outlet 141. The smoke outlet 141 is configured toenable the smoke formed by the e-liquid entering the atomizing core 30and being atomized by the atomizing core 30 to flow into the airflowpassage 16.

An air outlet 161 is provided on the wall of the airflow passage 16. Theair outlet 161 is configured to enable the smoke to flow from theairflow passage 16 to the outside for the user to inhale.

In other embodiments, the housing assembly 10 is also formed with an airinlet (not shown). When using the above-mentioned aerosol generatingdevice 100, the external air enters from the air inlet, the smokeobtained through atomization by the atomizing core passes through theairflow passage 16 with the airflow and is exported from the air outlet161 for the user to inhale.

Specifically, the atomizing core 30 is configured to atomize thee-liquid delivered to the atomizing core 30 into smoke. The atomizingcore 30 includes a heating assembly 31 and a liquid guiding member 32.The heating assembly 31 is provided on the liquid guiding member 32, theliquid guiding member 32 is fixed on the inner wall of the atomizingchamber 14 and is in fluid communication with the liquid outlet 132. Theliquid guiding member 32 is configured to transmit the e-liquid in theliquid storage chamber 13 to the heating assembly 31 and store thee-liquid temporarily. The liquid guiding member 32 includes an absorbingsurface 321 and an atomizing surface 322. The absorbing surface 321faces the liquid outlet 132, while the atomizing surface 322 is oppositeto the absorbing surface 321. The heating assembly 31 is fixed on theatomizing surface 322 of the liquid guiding member 32 to heat andatomize the e-liquid transmitted from the liquid guiding member 32 tothe heating assembly 31.

Specifically, the heating assembly 31 is provided on the liquid guidingmember 32 by directly fixing, wrapping, winding and the like. In thisembodiment, the heating assembly 31 is directly fixed on the liquidguiding member 32.

The liquid guiding member 32 is an element having the function ofabsorbing e-liquid and/or transporting e-liquid, such as cotton, glassfiber, porous ceramics and the like.

The battery assembly 40 is received in the battery chamber 15 andelectrically connected to the heating assembly 31. The battery assembly40 is configured to provide the heating assembly 31 with electric energyrequired to atomize the e-liquid.

In this embodiment, the aerosol generating device 100 further includes amouthpiece 50. The mouthpiece 50 is in communication with the airflowpassage 16 through the air outlet 161. The smoke flowing out through theair outlet 161 of the airflow passage 16 flows out through themouthpiece for the user to inhale. In other embodiments, the aerosolgenerating device 100 may not include the mouthpiece 50.

In another embodiment, the aerosol generating device 100 furtherincludes a heat insulating layer 60. The heat insulating layer 60 isdisposed on the inner wall of the airflow passage 16. The heatinsulating layer 60 is beneficial to preventing the heat loss in theairflow passage 16, thereby preventing the smoke from rapidly coolingand condensing into e-liquid on the inner wall of the airflow passage 16caused by the rapid temperature drop in the airflow passage 16.

In another embodiment, the aerosol generating device 100 furtherincludes a liquid absorbing member 70. The liquid absorbing member 70 isarranged on the heat insulating layer 60, and the liquid absorbingmember 70 is configured to absorb condensed e-liquid. Specifically, theliquid absorbing member 70 is a hollow columnar or other shape. Theliquid absorbing member 70 is made of porous materials, such assuperabsorbent resin, sponge, cotton, paper, porous ceramics or otherporous materials.

In another embodiment, the aerosol generating device 100 furtherincludes a liquid absorbing member 70. The liquid absorbing member 70 isarranged on the inner wall of the airflow passage 16, which is notshown.

Please refer to FIG. 2 , the first embodiment of the present disclosureprovides a heating assembly 31 a. The heating assembly 31 a includes asubstrate 311 and a heat insulation structure 314, at least one heatgenerating element 315 and at least two electrical contacts 317 formedon the substrate 311, wherein the heat insulation structure 314 islocated between the heat generating element 315 and the electricalcontacts 317. The heat generating element 315 is configured to generateheat, so as to heat and atomize the e-liquid transmitted from the liquidguiding member 32 to the heating assembly 31 a. The electrical contacts317 are electrically connected to the heat generating element 315. Theheat insulation structure 314 is configured to reduce or prohibit heattransfer between the electrical contacts 317 and the heat generatingelement 315, so as to limit the heat loss caused by the heat generatingelement 315, and prevent the heat generated by the heat generatingelement 315 from rapidly transferring to the electrical contacts 317 tocause the temperature of the electrical contacts 317 to be too high. Theforms of heat transfer include radiation, conduction, and convection. Inthis embodiment, the heat generating element 315 is electricallyconnected to the electrical contacts 317 through conductive wires 318.Specifically, the heat generating element 315 is electrically connectedto the two electrical contacts 317 through two conductive wires 318,with each conductive wire 318 being connected between the heatgenerating element 315 and a corresponding electrical contact 317. Theconductive wire 318 includes but not limited to metal paste, metal film,and lead. The heat insulation structure 314 may be a structure with lowthermal conductivity such as a heat insulating layer, a heat insulatingmember, or an air cavity. The heat insulating layer may be formed on thesurface of the substrate 311, or formed inside the substrate 311. Theheat insulation structure 314 is made of a material with low thermalconductivity, or a part of the substrate 311 is directly made of amaterial with low thermal conductivity. The heat insulation structure314 can be formed by methods including but not limited to chemicaletching, laser etching, electroplating, physical vapor deposition, andchemical vapor deposition. Optionally, the heat insulation structure 314is an air cavity. Therefore, in this embodiment, the heat insulationstructure 314 is at least one group of air cavities 314. Specifically,in this embodiment, the heat insulation structure 314 includes twogroups of air cavities 314, and each group of air cavities 314 isconsisted of two air cavities 314. The air cavity 314 penetrates throughthe substrate 311 along the thickness direction of the substrate 311,and the air cavity 314 is in contact with the external air.

The substrate 311 is roughly in the shape of a thin sheet or a thinplate, and has a first main surface A₁ and a second main surface A₂which are oppositely arranged. It can be understood that the first mainsurface A₁ and the second main surface A₂ may be circular, elliptical,or polygonal such as triangular, rectangular, trapezoidal, pentagonal,etc., which are not limited here. Optionally, the first main surface A₁and the second main surface A₂ are substantially planar.

Specifically, the material for preparing the substrate 311 may be metaloxide, nitride, carbide or the like. Optionally, the substrate 311 ismade of ceramic material, and further, the material of the substrate 311is aluminosilicate.

Two directions perpendicular to each other are defined on the substrate311 parallel to the first main surface A₁ or the second main surface A₂:the first direction X₁ and the second direction X₂. The substrate 311includes two opposite first side edges 3111 in the first direction X₁and two opposite second side edges 3112 in the second direction X₂. Inthis embodiment, the first main surface A₁ of the substrate 311 isrectangular, and the two first side edges 3111 are perpendicularlyconnected to the two second side edges 3112. In other embodiments, thefirst main surface A₁ of the substrate 311 may also be in otherpolygonal or circular shapes, so that the substrate 311 also includesother side edges, the two first side edges 3111 and the two second sideedges 3112 are respectively connected to at least one other side edge.If the cross-section of the substrate 311 is circular, the first sideedges 3111 may be simplified as two tangent points in the firstdirection X₁, and the second side edges 3112 may be simplified as twotangent points in the second direction X₂. A third direction X₃ isdefined along the vertical direction of the first main surface A₁, andthe third direction X₃ is the thickness direction of the substrate 311.

In this embodiment, the substrate 311 has a thickness of about 0.4 mm, atotal width of 12.0 mm, and a thermal conductivity of about 3 Wm⁻¹K⁻¹.In this embodiment, the heating assembly 31 a includes two groups offour air cavities 314 and two electrical contacts 317. The two groups ofair cavities 314 are respectively arranged on both sides of the heatgenerating element 315, and an electrical contact 317 is provided on oneside of each group of air cavities 314 away from the heat generatingelement 315. In one embodiment, the heat generating element 315 isarranged at the center of the substrate 311, and the electrical contacts317 are arranged at the ends of the substrate 311.

In this embodiment, the two air cavities 314 of each group are alignedin the second direction X₂.

Specifically, in the first direction X₁, each of the air cavities 314includes two opposite third side edges 3141, and in the second directionX₂, each of the air cavities 314 includes two opposite fourth side edges3142. The two third side edges 3141 are parallel to the two first sideedges 3111, and the two fourth side edges 3142 are parallel to the twosecond side edges 3112.

In this embodiment, the first main surface A₁ of the substrate 311 isrectangular, the two first side edges 3111 are perpendicularly connectedto the two second side edges 3112. The cross-section of the air cavity314 on the first main surface A₁ is also rectangular. The two third sideedges 3141 are perpendicularly connected to the two fourth side edges3142. Specifically, each air cavity 314 is rectangular and has a lengthextending along the length direction of the substrate 311. In thisembodiment, the first direction X₁ is the length direction of thesubstrate 311, and the second direction X2 is the width direction of thesubstrate 311.

In other embodiments, the cross-section of the air cavity 314 on thefirst main surface A₁ may also be in polygonal or circular shapes, andthus the air cavity 314 also includes other side edges, and the twothird side edges 3141 and the two fourth side edges 3142 arerespectively connected to at least one other side edge. If thecross-section of the air cavity 314 on the first main surface A₁ iscircular, the third side edges 3141 can be simplified as two tangentpoints in the first direction X₁, and the fourth side edges 3142 can besimplified as two tangent points in the second direction X₂.

In the first direction X₁, the heating assembly 31 a is divided into atleast one cold area 303, at least one transition area 302 and at leastone hot area 301, wherein one end of the transition area 302 isconnected to the cold area 303, and the other end of the transition area302 is connected to the hot area 301. Specifically, the cold area 303refers to the area jointly enclosed by the two second side edges 3112,the extension line RR′ of the third side edge 3141 of at least one aircavity 314 adjacent to the electrical contact 317, and the first sideedge 3111 adjacent to the electrical contact 317. The transition area302 refers to the area jointly enclosed by the two second side edges3112 and the extension lines RR′ and QQ′ of the two opposite third sideedges 3141 of at least one air cavity 314. The hot area 301 refers tothe area jointly enclosed by the two second side edges 3112 and theextension lines PP′ and QQ′ of the third side edges 3141 of the aircavities 314 located at opposite sides of the heat generating element315, or refers to the area jointly enclosed by the two second side edges3112, the extension line PP′ of the third side edge 3141 of at least oneair cavity 314 adjacent to the heat generating element 315, and thefirst side edge 3111 adjacent to the heat generating element 315. Theelectrical contact 317 is located in the cold area 303, the air cavity314 is located in the transition area 302, the heat generating element315 is located in the hot area 301.

In this embodiment, the heating assembly 31 a is divided into two coldareas 303, two transition areas 302 and a hot area 301 along the lengthdirection of the substrate 311, wherein the hot area 301 is located atthe center of the substrate 311, the two cold areas 303 are located atopposite ends of the substrate 311, the two transition areas 302 arerespectively located at two opposite sides of the hot area 301 with eachtransition area 302 being located between the hot area 301 and acorresponding cold area 303; the heat generating element 315 is arrangedin the hot area 301, the two electrical contacts 317 are respectivelyarranged in the two cold areas 303, the heat insulation structure 314includes two groups of air cavities 314, and the two groups of aircavities 314 are respectively arranged in the two transition areas 302.It can be understood that in the present disclosure, a transition area302 is provided between the hot area 301 and the cold area 303. Thus,during the transfer of heat from the hot area 301 to the cold area 303,due to the existence of the transition area 302, the heat is stopped inthe direction of transfer, and the temperature drops sharply, so thatthe temperature of the cold area 303 is kept at a relatively low level.Optionally, the temperature of the cold area 303 is below 100° C. Inthis embodiment, the hot area 301 refers to the area enclosed by the twosecond side edges 3112, the extension lines PP′ and QQ′ of the thirdside edges 3141 of the air cavities 314 adjacent to the heat generatingelement 315.

Please continue to refer to FIG. 2 , in the second direction X₂, thedistance between the second side edge 3112 and the fourth side edge 3142of the air cavity 314 adjacent to the second side edge 3112 is W₁; thedistance between the two fourth side edges 3142 of each air cavity 314is W₂, the distance between two adjacent air cavities 314 is W₃, thedistance between the two second side edges 3112 of the substrate 311 isW; then, W=2W₁+mW₂+(m−1)W₃; optionally, (mW₂)/W>40%, W₃/W₁>150%, so asto ensure that the air cavity 314 has sufficient resistance to heat,wherein m is the number of the air cavity 314, m is a positive integerand m≥1. In this embodiment, m=2.

The cross-sectional area of each of the air cavities 314 on the firstmain surface A₁ is A₁, the total cross-sectional area of the first mainsurface A₁ of the substrate 311 is A₂, the ratio of the totalcross-sectional area mA₁ of the air cavities 314 to the totalcross-sectional area A₂ of the substrate 311 is defined as the qualityindex E of the heating assembly 31 a, wherein the quality index E canreflect the thermal decoupling efficiency of the heating assembly 31 a.Optionally, the thickness of the heating assembly 31 a may be selectedto be 0.1 mm-5 mm, then E=(mA₁)/A₂₉>15%. That is, when the thickness ofthe heating assembly 31 a is 0.1 mm to 5 mm, the quality index E of theair cavities 314 must be greater than 15%, so as to ensure that the aircavities 314 can effectively stop the heat of the hot area 301 from

transferring to the cold area 303. Please continue to refer to FIG. 2 ,in one embodiment, in the first direction X₁, the distance betweenopposite side edges of the hot area 301 is L₁, the distance between thetwo third side edges 3141 of each air cavity 314 is L₂; optionally,L₂/L₁>60%. Optionally, L₂ is 6 mm. This structure can achieve effectivethermal decoupling.

The heat generating element 315 can be an embedded thick film resistanceheater, a heating coating, a heating coil, a heating sheet, a heatingnet and the like. Specifically, the material for preparing the heatgenerating element 315 may be noble metal or common metal or conductiveoxide. Specifically, the noble metal may be ruthenium, platinum, gold,silver, palladium or their alloys. The common metal can be copper ornickel and the like. The conductive oxide may be ruthenium oxide or thelike. In this embodiment, the heat generating element 315 is made ofplatinum. Specifically, the thermal conductivity of the heat generatingelement 315 is about 72 Wm⁻¹K⁻¹. In this embodiment, the heat generatingelement 315 is two embedded thick film resistance heaters. Specifically,the heat generating element 315 has a thickness of 0.01 mm and a widthof 0.6 mm.

In the first direction X₁, the distance between the first side edge 3111and the third side edge 3141 of the air cavity 314 adjacent to the firstside edge 3111 is defined as L₅, then L₅ should be long enough tofacilitate the installation of the electrical contact 317. The area ofthe electrical contact 317 must be large enough to be compatible withstandard electrical contacts in the atomizing core 30 of the aerosolgenerating device 100.

The heating assembly 31 a further includes a plurality of releasingholes 316. The releasing hole 316 penetrates through the substrate 311along the third direction X₃ and is located in the hot area 301. Thereleasing holes 316 are arranged corresponding to the liquid guidingmember 32, and are configured for releasing the smoke generated by theatomization of the heat generating element 315 into the atomizingchamber 14.

Please continue to refer to FIG. 2 , the cross-sectional area of eachreleasing hole 316 is define as A3, then optionally, the ratio of thetotal cross-sectional area nA3 of the releasing holes 316 to the totalcross-sectional area A₂ of the substrate satisfies: 0.03%≤nA₃/A₂≤9.00%,wherein n is the number of the releasing holes 316, n is a positiveinteger and n>0.

Specifically, the ratio of the total cross-sectional area of thereleasing holes 316 to the total cross-sectional area of the substrate311 is a quality factor of the releasing holes 316 and can be used tocharacterize the effectiveness of the releasing holes 316. It should benoted that, the cross-section corresponding to the cross-sectional areais parallel to the first main surface A₁ or the first main surface A₂.

The radius of each releasing hole 316 is defined as r₁, then optionally,0.01≤r₁/L₁0.1. Such arrangement is beneficial to release the smokegenerated by the atomization of the heat generating element 315 into theatomizing chamber 14.

In one embodiment, in the first direction X₁, the shortest distance fromthe edge of the releasing hole 316 adjacent to the air cavity 314 to theedge of the adjacent air cavity 314 is defined as L₃, L₃/L₁>10%. In oneembodiment, in the second direction X₂, the distance from the edge ofthe releasing hole 316 adjacent to the second side edge 3112 to theadjacent second side edge 3112 is defined as L₄, L₄/L₁>10%. Sucharrangement is beneficial to release the smoke generated by theatomization of the heat generating element 315 into the atomizingchamber 14.

Please refer to FIG. 4 , a heating assembly 31 b is provided in thesecond embodiment of the present disclosure, the structure of theheating assembly 31 b is similar to that of the heating assembly 31 a,the only difference is that the air cavities 314 are only arranged onone side of the heat generating element 315. The electrical contacts 317are all located at one end of the substrate 311, and are not separatelylocated at both ends of the substrate 311, so that the heating assembly31 b has a larger heating area. Specifically, in this embodiment, theheating assembly 31 b is divided into a hot area 301, a cold area 303and a transition area 302 along the length direction of the substrate311, the hot area 301 is located at the center of the substrate 311 andextends to one end of the substrate 311, the cold area 303 is located atthe other end of the substrate 311, the transition area 302 is locatedbetween the hot area 301 and the cold area 303; wherein the heatgenerating element 315 is arranged in the hot area 301, the twoelectrical contacts 317 are arranged in the cold area 303, the heatinsulation structure 314 includes a group of air cavities 314, and thegroup of air cavities 314 is arranged in the transition area 303.Specifically, the group of air cavities 314 is consisted of two aircavities 314. In this embodiment, each air cavity 314 is rectangular andhas a length extending along the length direction of the substrate 311.

In this embodiment, please refer to FIG. 2 and FIG. 3 , the resistancevalue of the heating assembly 31 a can be calculated by the followingformulas:

$\begin{matrix}{{R_{thermal} = \frac{L_{bridge}}{k_{n} \cdot \left( {W_{i} \cdot T} \right)}},} & {{Formula}1}\end{matrix}$ $\begin{matrix}{{\frac{1}{R_{bridge}} = {\frac{2}{R_{airi}} + \frac{2}{R_{sidei}} + \frac{1}{R_{center}} + \frac{2}{R_{Pti}}}},} & {{Formula}2}\end{matrix}$${{{wherein}\frac{1}{R_{{air}1}}} = \frac{1}{R_{{air}2}}},{\frac{1}{R_{side1}} = \frac{1}{R_{side2}}},{\frac{1}{R_{{Pt}1}} = \frac{1}{R_{{Pt}2}}}$

wherein R_(thermal) is the absolute thermal resistance, L_(bridge) isthe length of the air cavity 314 in the first direction X₁ (that is, L₂in FIG. 2 ), kn is the thermal conductivity of the material or the air,T is the thickness of the heating assembly 31 a, W_(i) is the width ofeach part, and in the present embodiment, W_(i) corresponds to W₁, W₂,and W₃ described above. Therefore, in this embodiment, the total thermalresistance R_(bridge) of the heating assembly 31 a is composed ofseveral resistances connected in parallel, including the resistance(R_(air1)+R_(air2)) of the two groups of air cavities 314, theresistance R_(center) of the substrate 311 between the two groups of aircavities 314, the resistance R_(side1) and resistance R_(side2) of thesubstrate 311 between the air cavities 314 and the corresponding twofirst side edges 3111, and the resistances R_(Pt1) and R_(Pt2) of theconductive wires 318. In this embodiment, the total width W of thesubstrate 311 is 12.0 mm, W₁, W₂, W₃ are 3 mm, 4 mm and 1 mmrespectively, the embedded thick film resistance heater has a thicknessof 0.01 mm and a width of 0.6 mm, the length of the air cavity 314 is 6mm. The substrate 311 has a thickness of about 0.4 mm, a total width of12.0 mm, and a thermal conductivity of about 3 Wm⁻¹K⁻¹. The material ofthe embedded thick film resistance heater is platinum, and the thermalconductivity of the embedded thick film resistance heater is about 72Wm⁻¹K⁻¹. The thermal conductivity of the air in the air cavity 314 isabout 0.04 Wm⁻¹K⁻¹. In this embodiment, the thermal resistance of eachair cavity 314 is 463 KW⁻¹.

Please refer to FIG. 5 , FIG. 5 is an IR characteristic diagram of theheating assembly 31 b shown in FIG. 4 when working at 550° C. It can beseen from the figure that the air cavity 314 is used to realize thetransition between the heat generating element 315 and the electricalcontacts 317 of the heating assembly 31 b, so that the temperature ofthe cold area 303 can be maintained below 100° C., while the hot area ofthe heating assembly 31 b is maintained at a temperature of 550° C. to560° C. This shows that the heating assembly 31 b has good heatinguniformity and a lower level of heat transfer, so that the hot area 301where the heat generating element 315 is located and the cold area 303where the electrical contacts 317 are located can be effectivelyisolated.

Please refer to FIG. 6 , a heating assembly 31 c is provided in thethird embodiment of the present disclosure, the structure of the heatingassembly 31 c is similar to that of the heating assembly 31 b, the onlydifference is that the two air cavities 314 are aligned in the firstdirection X₁. Specifically, in this embodiment, each air cavity 314 isrectangular and has a length extending along the width direction of thesubstrate 311.

The heating assembly provided by the disclosure includes a heatgenerating element, a heat insulation structure (air cavity) andelectrical contacts, and the air cavity is arranged between theelectrical contacts and the heat generating element. Because the aircavity is filled with air and the thermal conductivity of air is low,therefore, the air cavity can limit heat loss of the hot area andprevent the heat of the hot area from rapidly transferring to the coldarea to cause the temperature of the cold area to be too high, therebynot only improving the atomizing efficiency of the atomizing core andthe aerosol generating device, but also reducing the heat resistancerequirements of the heating assembly, the atomizing core and the aerosolgenerating device for the electrical contacts.

The present disclosure also provides a method for manufacturing aheating assembly, including:

Step 1: forming a substrate by casting.

A mixture of ceramic powder and organic components is cast into astrip-shaped substrate with a thickness of 0.2 mm to 2 mm.

Step 2: processing the substrate to form a desired structure.

The strip-shaped substrate is cut into a desired size so as to be usedas the substrate for a heating assembly;

A heat insulation structure is formed on the substrate by laser cuttingor stamping process, and the heat insulation structure may be an aircavity, or a heat insulating member, and the like.

Optionally, this step may also include forming releasing holes and/orelectrical through holes on the substrate by laser cutting or stamping.

Step 3: printing a heat generating element and electrical contacts onthe substrate.

This step includes printing the heat generating element (resistanceheating material) of a required pattern and the electrical contacts onthe substrate to form a semi-finished product by screen printingprocess.

The electrical contacts include electrical pads. Further, this step alsoincludes printing conductive wires on the substrate, the conductivewires are configured to connect the heat generating element to theelectrical contacts.

Step 4: drying the semi-finished product obtained in step 3.

Step 5: stacking the semi-finished products obtained after drying instep 4, wherein the heat generating element is embedded inside thesubstrate, and the electrical contacts are located on the surface of thesubstrate.

Step 6: thermally compressing the semi-finished products obtained instep 5 at a temperature of 40° C.-100° C., and then sintering at a hightemperature (800° C.-1600° C.) to remove organic components and finallyto become a whole.

The above descriptions are only preferred embodiments of the presentapplication, and do not limit the present application in any form.Although the present application has been disclosed above with preferredembodiments, it is not intended to limit the present application. Thepersons skilled in the art may make some changes or modifications byusing the technical content disclosed above, and if they do not departfrom the technical content of the present application, any simplemodifications, equivalent changes and modifications made to the aboveembodiments still fall within the protection scope of the technicalsolution of the present application.

What is claimed is:
 1. A heating assembly for being used in an aerosolgenerating device, comprising: a substrate; at least one heat generatingelement, wherein the heat generating element is formed on the substrate;at least two electrical contacts, wherein the electrical contacts areformed on the substrate, the electrical contacts are electricallyconnected to the heat generating element; at least one heat insulationstructure, wherein the heat insulation structure is formed on thesubstrate and located between the heat generating element and theelectrical contacts.
 2. The heating assembly according to claim 1,wherein the heat generating element is arranged at the center of thesubstrate, and the electrical contacts are arranged at the ends of thesubstrate.
 3. The heating assembly according to claim 2, wherein theheat insulation structure is located on one side of the heat generatingelement, and the at least two electrical contacts are located at one endof the substrate away from the heat generating element.
 4. The heatingassembly according to claim 1, wherein the heat insulation structure isair cavity.
 5. The heating assembly according to claim 4, wherein theair cavity penetrates through the substrate along a thickness directionof the substrate.
 6. The heating assembly according to claim 4, whereina group of air cavities are respectively formed on both sides of eachheat generating element, and a side of each group of air cavities awayfrom the heat generating element is formed with one of the electricalcontacts.
 7. The heating assembly according to claim 1, wherein theheating assembly is divided into a cold area, a hot area and atransition area, the heat generating element is arranged in the hotarea, and the electrical contacts are arranged in the cold area, theheat insulation structure is arranged in the transition area.
 8. Theheating assembly according to claim 1, wherein the heating assembly isdivided into a hot area, two cold areas and two transition areas along alength direction of the substrate, the hot area is located at the centerof the substrate, the two cold areas are located at opposite ends of thesubstrate, the two transition areas are respectively located at twoopposite sides of the hot area with each transition area being locatedbetween the hot area and a corresponding cold area; wherein the heatgenerating element is arranged in the hot area, the two electricalcontacts are respectively arranged in the two cold areas, the heatinsulation structure includes two groups of air cavities, and the twogroups of air cavities are respectively arranged in the two transitionareas.
 9. The heating assembly according to claim 1, wherein the heatingassembly is divided into a hot area, a cold area and a transition areaalong a length direction of the substrate, the hot area is located atthe center of the substrate and extends to one end of the substrate, thecold area is located at the other end of the substrate, the transitionarea is located between the hot area and the cold area; wherein the heatgenerating element is arranged in the hot area, the two electricalcontacts are arranged in the cold area, the heat insulation structureincludes a group of air cavities, and the group of air cavities isarranged in the transition area.
 10. The heating assembly of claim 4,wherein the substrate comprises a first main surface and a second mainsurface which are oppositely disposed, two directions perpendicular toeach other are defined on the substrate parallel to the first mainsurface or the second main surface: a first direction and a seconddirection; the substrate includes two opposite first side edges in thefirst direction and two opposite second side edges in the seconddirection; in the first direction, each of the air cavities includes twoopposite third side edges; in the second direction, each of the aircavities includes two opposite fourth side edges; the two third sideedges are parallel to the two first side edges, the two fourth sideedges are parallel to the two second side edges.
 11. The heatingassembly of claim 10, wherein in the second direction, the distancebetween the second side edge and the fourth side edge of the air cavityadjacent to the second side edge is W₁, the distance between the twofourth side edges of each air cavity is W₂, the distance between twoadjacent air cavities is W₃, the distance between the two second sideedges of the substrate is W, then, W=2W₁+mW₂+(m−1)W₃, (mW₂)/W>40%,W₃/W₁>150%; m is the number of the air cavity, m is a positive integerand m≥1.
 12. The heating assembly according to claim 7, wherein, in thefirst direction X₁, the distance between opposite side edges of the hotarea is L₁, the distance between the two third side edges of each aircavity is L₂, then L₂/L₁>60%.
 13. The heating assembly according toclaim 7, further comprising a plurality of release holes, the releasehole penetrates through the substrate and is located in the hot area.14. An atomizing core comprising a liquid guiding member, wherein theatomizing core further comprises the heating assembly of claim
 1. 15. Anaerosol generating device comprising a battery assembly, an atomizingchamber, an airflow passage, and the atomizing core according to claim14; wherein the airflow passage is communicated with the atomizingchamber; the airflow passage is configured to discharge an aerosolflowing out of the atomizing chamber to the outside for a user toinhale; the battery assembly is electrically connected to the heatgenerating element, the battery assembly is configured to provide theheat generating element with electrical energy required to atomize anaerosol-forming substrate.